docs: def get_urls(self):
          """
          Add a calendar URL.
          """
          from django.conf.urls import patterns, url
          urls = super(EventAdmin, self).get_urls()
          my_urls = patterns(
              '',
              url(
                  r'^calendar/$',
                  self.admin_site.admin_view(self.calendar),
                  name='icekit_events_eventbase_calendar'
              ),
              url(
                  r'^calendar_data/$',
                  self.admin_site.admin_view(self.calendar_data),
                  name='icekit_events_eventbase_calendar_data'
              ),
          )
          return my_urls + urls